The more we learn about the Orlando terrorist who killed 53 and wounded at least 50 early Sunday morning, the less secure we feel. It’s now more than apparent that gunman Omar Mateen was an ISIS devotee, with multiple ties to terrorists and terrorist organizations.

At the same time, we’re now learning that this follower of radical Islam was also employed by a security firm supporting none other than the U.S. Department of Homeland Security. The contractor, who employed Mateen for nearly a decade, was charged with helping DHS identify “suspected terrorists” as they enter the U.S. It also provides security guards and services for “90 percent of U.S. nuclear facilities.”

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The Orlando nightclub terrorist who pledged allegiance to ISIS worked almost a decade for a major Department of Homeland Security contractor, raising alarms that ISIS sympathizers and agents have infiltrated the federal agency set up after 9/11 to combat terrorists.

Officials say Omar Mir Seddique Mateen, an Afghan-American who held two firearms licenses and a security officer license, was employed by the security firm G4S Secure Solutions USA Inc. since Sept. 10, 2007. The Jupiter, Fla.-based company merged with the Wackenhut Corp. after 9/11 and assumed federal contracts.

“G4S supports the U.S. Department of Homeland Security, Customs and Border Protection (CPB), with its operations at the U.S. ­ Mexico border and with U.S. Immigration and Customs Enforcement (ICE) to transport illegal immigrants in selected urban areas,” the company says in a brochure, titled “Providing Manpower Solutions for Government Services.”

The DHS contract with G4S is worth more than $234 million. The contract states that one of the “performance requirements” is helping identify “suspected terrorists” trying to enter the U.S.

The security contractor also provides security guards and other security services for “90 percent of U.S. nuclear facilities.”

G4S uses fortified buses to transport “hundreds of thousands of illegal immigrants” from city to city and from cities to the U.S.-Mexican border. But earlier this month, Judicial Watch revealed G4S has been quietly moving and releasing van loads of illegal aliens away from the border to interior American cities.

It’s not clear if the 29-year-old Mateen worked on any federal contracts or dealt with federal inmates. One of his jobs was to help transport and guard state and local prisoner youths in Florida. The subsidiary he worked for — G4S Secure Solutions USA Inc. — is based in Jupiter, Fla., which is located just south of Mateen’s home in Fort Pierce, Fla.

It’s also not immediately known if he had federal security clearances, or what kind of security background check G4S administered before hiring Mateen.

But he continued to guard prisoners despite reports he openly praised ISIS in conversations with co-workers, and even though he had been under federal investigation for terrorism ties since at least 2013.

In a 2012 company newsletter, G4S congratulated Mateen for five years of service.

G4S, which was the first contract security company to received designation and certification by DHS, also helps the federal government with emergency security responses to “terror threats.”

Let that sink in for a few moments. The man who just committed the worst terrorist massacre on U.S. soil since 9/11 was, for all intents and purposes, employed by our own Department of Homeland Security, ostensibly to help fight the very terror organizations to which he pledged allegiance.

How many more like Mateen are still out there doing the same thing? Even if they’re not committing atrocities such as the Orlando nightclub shooting, how well are they serving to protect us from terrorists trying to infiltrate? More to the point, really: how are they likely using their insider status to help fellow terrorists infiltrate our borders — not to mention, our very government?

And the contractor Mateen worked for isn’t just supporting the Department of Homeland Security. As Sperry reports:

Employing more than 50,000 Americans, G4S provides security support for several other federal agencies, as well, including the departments of State, Interior, Labor, Justice and Energy, and the IRS and Drug Enforcement Administration. The security firm also partners with the U.S. Army, U.S. Air Force and NASA.

Meet Allen West

Allen West was born and raised in Atlanta, Georgia in the same neighborhood where Dr. Martin Luther King, Jr. once preached. He is the third of four generations of military servicemen in his family.

During his 22 year career in the United States Army, Lieutenant Colonel West served in several combat zones: in Operation Desert Storm, in Operation Iraqi Freedom, where he was a Battalion Commander in the Army’s 4th Infantry Division, and later in Afghanistan.